<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>DIV</title>
    <style>
      *{
        padding: 0;
        margin: 0;
      }
      div{
        width: 500px;
        height: 500px;
        background-color: aqua;
        border: 5px dotted red;
        border-right: 10px solid blue;
        padding: 10px;
        margin: 10px;
        margin-top: 50px;
      }
    </style>
</head>
<body>
      <div>
          我是一个div啊啊啊
          <br/>
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      </div>
</body>
</html>